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Growth of Ligia exotica (Isopoda: Oniscidea: Ligiidae) in two estuarine regions of Patos Lagoon, Rio Grande do Sul, Brazil

Published online by Cambridge University Press:  15 May 2009

Elis R. Lopes-Leitzke ,
Luiz F.C. Dumont  and
Fernando D'Incao
Elis R. Lopes-Leitzke*
Affiliation:
FURG, Laboratório de Crustáceos Decápodos, Instituto de Oceanografia, CP: 474, CEP: 96201-900, Rio Grande, RS, Brazil
Luiz F.C. Dumont
Affiliation:
FURG, Laboratório de Crustáceos Decápodos, Instituto de Oceanografia, CP: 474, CEP: 96201-900, Rio Grande, RS, Brazil
Fernando D'Incao
Affiliation:
FURG, Laboratório de Crustáceos Decápodos, Instituto de Oceanografia, CP: 474, CEP: 96201-900, Rio Grande, RS, Brazil
*
Correspondence should be addressed to: E.R. Lopes-Leitzke, FURG, Laboratório de Crustáceos Decápodos, Instituto de Oceanografia, CP: 474, CEP: 96201-900, Rio Grande, RS, Brazil email: [email protected]
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Abstract

The aim of this study was to estimate growth parameters of two populations of Ligia exotica inhabiting discrete estuarine areas of Patos Lagoon, Rio Grande do Sul, Brazil. Sampling was performed fortnightly at two different estuarine zones, named Leonideo Island and West Breakwater, to detect different growth patterns for this species by using the von Bertalanffy growth model (VBGM). The VBGM estimated were as follows: TLmm = 34.57 (1−e−0.012(t−2.93)) (males in Leonideo Island), TLmm = 35.61(1−e−0.009(t−5.87)) (males in West Breakwater), TLmm = 30.11(1−e−0.009(t−5.84)) (females in Leonideo Island) and TLmm = 29.65(1−e−0.01(t−4.87)). Significant sexual dimorphism was observed, since males reach larger TL (mm) by higher k value (day) and consequently a faster growth pattern. Different growth patterns of males were also detected comparing both populations, in such a way that the West Breakwater individuals are larger than those from the Leonideo Island. One possible explanation is the higher food availability observed in the former site, as well as favourable environmental parameters, providing better conditions for individual growth. Briefly, two different populations of L. exotica were detected in the studied area, presenting discrete growth parameters highly influenced by environmental factors.

Keywords

OniscideaLigia exoticagrowthpopulation dynamicsEstuary of Patos Lagoon
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Issue 4 , June 2009 , pp. 735 - 741
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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